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1 // Copyright David Abrahams, Daniel Wallin 2003.
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE_1_0.txt or copy at
4 // http://www.boost.org/LICENSE_1_0.txt)
5
6 #ifndef BOOST_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
7 #define BOOST_PARAMETER_AUX_PACK_MAKE_DEDUCED_ITEMS_HPP
8
9 #include <boost/parameter/aux_/void.hpp>
10 #include <boost/parameter/aux_/pack/deduced_item.hpp>
11 #include <boost/parameter/deduced.hpp>
12 #include <boost/parameter/config.hpp>
13
14 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
15 #include <boost/mp11/utility.hpp>
16 #include <type_traits>
17 #else
18 #include <boost/mpl/eval_if.hpp>
19 #include <boost/mpl/identity.hpp>
20 #include <boost/type_traits/is_same.hpp>
21 #endif
22
23 namespace boost { namespace parameter { namespace aux {
24
25     template <typename Spec, typename Tail>
26 #if defined(BOOST_PARAMETER_CAN_USE_MP11)
27     using make_deduced_items = ::boost::mp11::mp_if<
28         ::std::is_same<Spec,::boost::parameter::void_>
29       , ::boost::mp11::mp_identity< ::boost::parameter::void_>
30       , ::boost::mp11::mp_if<
31             ::boost::parameter::aux::is_deduced<Spec>
32           , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
33           , Tail
34         >
35     >;
36 #else
37     struct make_deduced_items
38       : ::boost::mpl::eval_if<
39             ::boost::is_same<Spec,::boost::parameter::void_>
40           , ::boost::mpl::identity< ::boost::parameter::void_>
41           , ::boost::mpl::eval_if<
42                 ::boost::parameter::aux::is_deduced<Spec>
43               , ::boost::parameter::aux::make_deduced_item<Spec,Tail>
44               , Tail
45             >
46         >
47     {
48     };
49 #endif  // BOOST_PARAMETER_CAN_USE_MP11
50 }}} // namespace boost::parameter::aux
51
52 #endif  // include guard
53